RE: Rman/Legato/Architecture

interesting ,
we are actually thinking about using this. what are your thoughts .
how are restores performed if data is moved to tape.

"Browett, Darren" <dbrowett_at_coquitlam.ca> wrote:
Legato has a feature called staging, which we are using. In short,
we backup up to disk, then based on age of the files, 2 days, 5 days,
7days,
the savesets are moved to tape. Works great.

I'm not a Legato expert but ...
I think a big part of the problem is that during backup, rman can shovel
the
files into Networker in parallel, but when it is time to restore the
files,
the parallelism (or most of it) goes away. We have started keeping a
copy
of the backup on disk as well as on tape. We have just started this for
the
same reason you have experienced, so we are still experimenting. Our
current strategy -- subject to change if somebody comes along with
something
better -- is to backup to disk; then run a script that uses mminfo to
see
what is on disk that isn't on tape; then use the save command to send
the
new files to tape; then delete yesterday's backup from disk. In our
case,
we have about 1.8 Tb allocated for this. So yeah, we're talking about a
wee
bit of disk space here.

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